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Paper Information

Journal:   JOURNAL OF DENTAL RESEARCH, DENTAL CLINICS, DENTAL PROSPECTS   2018 , Volume 12 , Number 1; Page(s) 12 To 17.
 
Paper: 

EFFECT OF SURFACE PREPARATION WITH ND:YAG AND ER,CR:YSGG LASERS ON THE REPAIR BOND STRENGTH OF LITHIUM DISILICATE GLASS CERAMIC TO A SILORANE-BASED COMPOSITE RESIN

 
 
Author(s):  EBRAHIMI CHAHAROM MOHAMMAD ESMAEEL, POURNAGHI AZAR FATEMEH, MOHAMMADI NARMIN, NASIRI REZVAN*
 
* DEPARTMENT OF OPERATIVE DENTISTRY, FACULTY OF DENTISTRY, ARAK UNIVERSITY OF MEDICAL SCIENCES, ARAK, IRAN
 
Abstract: 

Background: This study was undertaken to evaluate the repair bond strength of lithium disilicate glass ceramic to a silorane-based composite resin after surface preparation with Nd: YAG and Er, Cr: YSGG lasers.
Methods: A total of 102 lithium disilicate glass ceramic samples (IPS e.max Press), measuring 5 mm in diameter and 4 mm in thickness, were randomly assigned to 6 groups (n=17): group 1, no surface preparation (control); group 2, acid etching with 9.5% hydrofluoric acid (HF); group 3, surface preparation with 4.5-W Nd: YAG laser; group 4, surface preparation with 6-W Nd: YAG laser; group 5, surface preparation with 1.5-W Er, Cr: YSGG laser; and group 6, surface preparation with 6-W Er, Cr: YSGG laser. After preparation of surfaces and application of silane, all the samples were repaired with the use of a silorane-based composite resin, followed by storage in distilled water at a temperature of 37°C for 24 hours and thermocycling. Finally, the samples were subjected to a shearing bond strength test; the fracture modes were determined under a stereomi-croscope.
Results: There were significant differences between the HF group and the other groups (P=0.000). Two-by-two comparisons of the other groups revealed no significant differences (P>0.05).
Conclusion: Use of HF proved the most effective surface preparation technique to increase the repair bond strength between lithium disilicate glass ceramic and silorane-based composite resin; compared to the control group.

 
Keyword(s): ER, CR: YSGG LASER, ND: YAG LASER, HF, LITHIUM DISILICATE GLASS CERAMIC
 
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